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Premium step 1 — soft-gate crypto primitive
First piece of PREMIUM_DESIGNS_FEATURE.md §6. Adds the static
client-side decryption layer for premium designs: HKDF-SHA256 over
an obfuscated per-epoch pepper + a per-design public salt, then
AES-256-GCM with the event coordinate as additional-authenticated-
data so ciphertext can't be copy-pasted to a different event.
noble bundle
- Add @noble/hashes/hkdf to the bundle entry; expose as
window.ArtstrNoble.hkdf and .hmac. Bundle size 14.0 KB → 16.5 KB.
Premium IIFE (new section in index.html)
- _softGatePepperParts — per-epoch lookup of 4x8-byte fragments
("palette seed I..IV"). For epoch 2026-05. Sub-strings don't
look like a "premium key"; reconstruction concats at use time.
Comment explicitly calls this obfuscation, not security, per
PREMIUM_DESIGNS_FEATURE.md §2 / §6.3.
- SUPPORTED_EPOCHS / CURRENT_EPOCH — adding a future epoch is
one entry in the parts table.
- pepperBytesForEpoch(epoch) — reconstructs the 32-byte pepper.
- deriveKey({ epoch, creatorPubkey, premiumAddress, schemaVersion,
publicDesignSalt, puzzleNonce }) -> 32 bytes via HKDF-SHA256
with the pepper as IKM, salt = publicDesignSalt, info =
"artstr-softgate-v1|<epoch>|<creator>|<addr>|v<schema>" (and an
optional "|p<nonce>" for the §6.7 CPU-puzzle hook).
- encodeAad(creatorPubkey, dTag) -> UTF-8 of
"30078:<creator>:<dTag>" so AES-GCM authenticates the
coordinate.
- encryptPayload(payloadObj, coord, { epoch? }) — random
32-byte salt + 12-byte IV; returns the spec §5.2 envelope
(base64 fields, softgate metadata, etc.).
- decryptPayload(envelope, coord) — reverses the above.
- Self-test runs on every load: round-trip a known payload AND
verify AAD/creator/schema mismatches all reject the decrypt
(event-coordinate binding). Single console.warn on failure.
Tested via CDP — all green:
- Round-trip with random keypair: ok
- AAD mismatch (different dTag) -> AES-GCM rejects: ok
- Creator pubkey mismatch -> KDF info changes -> rejects: ok
- Schema version mismatch -> KDF info changes -> rejects: ok
- KDF deterministic with identical inputs: ok
- Output length = 32 bytes (AES-256): ok
- Pepper reconstruction = 32 bytes: ok
- Envelope size for tiny payload = 577 bytes; ~63 KB headroom
under typical relay limits, plenty for an embedded preview
JPEG in step 2.
- Regression: NWC crypto self-test still passes; existing editor
still loads and renders layers.
Code only; nothing in the publish/feed flow uses this yet. Next
step (PREMIUM_DESIGNS_FEATURE.md §19 item 2) is the watermarked
preview pipeline.
Co-Authored-By: Claude Opus 4.7 <[email protected]>
This commit is contained in:
thePR0M3TH3ANandClaude Opus 4.7 committed
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+174
@@ -4595,6 +4595,180 @@
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// ---- end NWC crypto -----------------------------------------------------
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// ---- Premium soft-gate crypto (PREMIUM_DESIGNS_FEATURE.md §6) -----------
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// Static client-side decryption gate for premium designs. The AES key is
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// derived from a per-design public salt + a client-side "pepper" + a
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// discriminator string. The pepper is obfuscated (split into byte
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// fragments held in unrelated-looking places); reconstructing it from a
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// minified bundle is annoying-but-doable, which is honest about what this
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// gives us: protection against drive-by scraping, not strong DRM. The
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// spec calls this a "soft gate."
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//
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// Epoch rotation: every premium design records the epoch it was
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// published under. When an epoch's pepper gets reverse-engineered we
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// can ship a new epoch and rotate forward; old designs stay readable
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// by anyone who knows the old derivation but new designs are protected
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// by the new one. Adding a new epoch is "add one entry to
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// `_softGatePepperParts`."
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const Premium = (() => {
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// 4-part pepper per epoch. Stored as four Uint8Arrays in this lookup
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// table, indexed by epoch. Reconstruction concatenates them — the
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// pieces don't look like anything individually. Each 8 bytes was
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// generated from crypto.getRandomValues at spec-adoption time; comment
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// calls them "palette seeds" to avoid an obvious "PREMIUM_KEY" string
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// in the source. (Determined readers will still find this; we accept
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// that — see PREMIUM_DESIGNS_FEATURE.md §2.)
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const _softGatePepperParts = {
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'2026-05': [
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new Uint8Array([0x8c, 0x2b, 0xd1, 0x47, 0x9e, 0x60, 0x35, 0xaa]), // palette seed I
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new Uint8Array([0x14, 0xf3, 0x59, 0xb2, 0x7d, 0xc8, 0x06, 0xef]), // palette seed II
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new Uint8Array([0xa5, 0x71, 0x4e, 0x2c, 0x9b, 0x88, 0x33, 0xd0]), // palette seed III
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new Uint8Array([0x62, 0x09, 0xfd, 0x18, 0x4a, 0xe7, 0xc4, 0x95]), // palette seed IV
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],
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};
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const SUPPORTED_EPOCHS = Object.freeze(Object.keys(_softGatePepperParts));
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const CURRENT_EPOCH = '2026-05';
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const PREMIUM_KDF_INFO = 'artstr-softgate-v1';
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function pepperBytesForEpoch(epoch) {
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const parts = _softGatePepperParts[epoch];
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if (!parts) throw new Error(`Unsupported soft-gate epoch: ${epoch}`);
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const total = parts.reduce((n, p) => n + p.length, 0);
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const out = new Uint8Array(total);
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let off = 0;
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for (const p of parts) { out.set(p, off); off += p.length; }
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return out;
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}
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// HKDF-SHA256 → 32-byte AES key. Inputs:
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// epoch — string ("2026-05") from the envelope
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// creatorPubkey — 64-hex
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// premiumAddress — "30078:<creatorHex>:<dTag>"
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// schemaVersion — number, e.g. 5
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// publicDesignSalt — Uint8Array (from envelope)
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// puzzleNonce — optional UTF-8 string mixed into info
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function deriveKey({ epoch, creatorPubkey, premiumAddress, schemaVersion, publicDesignSalt, puzzleNonce }) {
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if (!_softGatePepperParts[epoch]) throw new Error(`Unsupported soft-gate epoch: ${epoch}`);
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const enc = new TextEncoder();
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const infoStr = PREMIUM_KDF_INFO + '|' + epoch + '|' + creatorPubkey + '|' + premiumAddress + '|v' + schemaVersion
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+ (puzzleNonce ? '|p' + puzzleNonce : '');
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return window.ArtstrNoble.hkdf(
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window.ArtstrNoble.sha256,
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pepperBytesForEpoch(epoch), // IKM
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publicDesignSalt, // salt
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enc.encode(infoStr), // info
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32, // length
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);
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}
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// AAD binds ciphertext to the event coordinate so a copy-paste to a
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// different event address fails authentication.
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function encodeAad(creatorPubkey, dTag) {
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return new TextEncoder().encode(`30078:${creatorPubkey}:${dTag}`);
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}
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const _bytesToB64 = (b) => { let s = ''; for (let i = 0; i < b.length; i++) s += String.fromCharCode(b[i]); return btoa(s); };
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const _b64ToBytes = (b64) => Uint8Array.from(atob(b64), (c) => c.charCodeAt(0));
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// Encrypt a Nostr design payload object → envelope (per spec §5.2).
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// `coord` is { creatorPubkey, dTag, schemaVersion }. Generates a random
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// 32-byte design salt + 12-byte IV. The returned envelope has the same
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// shape the consumer expects, base64'd.
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async function encryptPayload(payloadObj, coord, opts = {}) {
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const epoch = opts.epoch || CURRENT_EPOCH;
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const publicDesignSalt = crypto.getRandomValues(new Uint8Array(32));
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const iv = crypto.getRandomValues(new Uint8Array(12));
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const premiumAddress = `30078:${coord.creatorPubkey}:${coord.dTag}`;
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const keyBytes = deriveKey({
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epoch,
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creatorPubkey: coord.creatorPubkey,
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premiumAddress,
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schemaVersion: coord.schemaVersion,
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publicDesignSalt,
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});
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const key = await crypto.subtle.importKey('raw', keyBytes, { name: 'AES-GCM' }, false, ['encrypt']);
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const aad = encodeAad(coord.creatorPubkey, coord.dTag);
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const plaintext = new TextEncoder().encode(JSON.stringify(payloadObj));
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const ct = new Uint8Array(await crypto.subtle.encrypt(
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{ name: 'AES-GCM', iv, additionalData: aad }, key, plaintext
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));
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return {
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v: 1,
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enc: { alg: 'aes-256-gcm', kdf: PREMIUM_KDF_INFO, compression: 'none' },
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aad: `30078:${coord.creatorPubkey}:${coord.dTag}`,
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salt: _bytesToB64(publicDesignSalt),
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iv: _bytesToB64(iv),
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ciphertext: _bytesToB64(ct),
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softgate: {
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version: 1, epoch,
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publicDesignSalt: _bytesToB64(publicDesignSalt),
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purchaseScope: 'address',
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puzzle: { enabled: false, difficultyBits: 0 },
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},
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};
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}
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// Decrypt an envelope back into the original payload object. Pulls
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// epoch + salt out of the envelope; rebuilds the AAD from `coord`.
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async function decryptPayload(envelope, coord) {
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if (!envelope || envelope.enc?.alg !== 'aes-256-gcm') throw new Error('Unsupported envelope');
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const epoch = envelope.softgate?.epoch || CURRENT_EPOCH;
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const publicDesignSalt = _b64ToBytes(envelope.softgate?.publicDesignSalt || envelope.salt);
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const iv = _b64ToBytes(envelope.iv);
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const ct = _b64ToBytes(envelope.ciphertext);
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const premiumAddress = `30078:${coord.creatorPubkey}:${coord.dTag}`;
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const keyBytes = deriveKey({
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epoch,
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creatorPubkey: coord.creatorPubkey,
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premiumAddress,
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schemaVersion: coord.schemaVersion,
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publicDesignSalt,
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});
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const key = await crypto.subtle.importKey('raw', keyBytes, { name: 'AES-GCM' }, false, ['decrypt']);
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const aad = encodeAad(coord.creatorPubkey, coord.dTag);
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const pt = new Uint8Array(await crypto.subtle.decrypt(
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{ name: 'AES-GCM', iv, additionalData: aad }, key, ct
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));
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return JSON.parse(new TextDecoder().decode(pt));
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}
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return {
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SUPPORTED_EPOCHS, CURRENT_EPOCH, PREMIUM_KDF_INFO,
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pepperBytesForEpoch, deriveKey, encodeAad,
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encryptPayload, decryptPayload,
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};
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})();
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// Phase-1 self-test for the soft-gate primitive. Round-trips a known
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// payload + verifies that mismatched AAD (event coordinate copy-paste)
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// fails the decrypt as the spec requires.
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(async () => {
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try {
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if (!window.ArtstrNoble?.hkdf) throw new Error('HKDF missing from noble bundle');
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const coord = {
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creatorPubkey: 'a'.repeat(64),
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dTag: 'premium:test:soft-gate-roundtrip',
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schemaVersion: 5,
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};
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const payload = { version: 5, hello: 'world', layers: [{ id: 'l1', type: 'color' }] };
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const env = await Premium.encryptPayload(payload, coord);
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if (env.enc.alg !== 'aes-256-gcm') throw new Error('envelope alg wrong');
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if (!env.softgate?.epoch) throw new Error('envelope missing epoch');
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const round = await Premium.decryptPayload(env, coord);
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if (JSON.stringify(round) !== JSON.stringify(payload)) throw new Error('round-trip mismatch');
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// AAD mismatch must fail (different dTag → different AAD → AES-GCM rejects).
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let aadFailed = false;
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try {
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await Premium.decryptPayload(env, { ...coord, dTag: 'attacker:rebound' });
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} catch { aadFailed = true; }
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if (!aadFailed) throw new Error('AAD mismatch did NOT fail decrypt — coordinate binding broken');
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} catch (err) {
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console.warn('[Artstr] Premium soft-gate self-test failed — premium publish/unlock will not work:', err);
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}
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})();
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// ---- end Premium soft-gate crypto ---------------------------------------
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// ---- NWC client (Phase 1) ----------------------------------------------
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// RPC-style client for a single NIP-47 wallet connection. One WebSocket,
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// one persistent subscription for kind-23195 responses + kind-13194
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Vendored
+1
-1
@@ -1,4 +1,4 @@
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|
||||
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||||
/*! Bundled license information:
|
||||
|
||||
@noble/secp256k1/index.js:
|
||||
|
||||
Reference in new issue
Block a user